Method and Apparatus for Internet Resource Sharing

1. A method of wireless communication by a user equipment (UE), comprising: determining whether to use an Internet Protocol (IP) connectivity of a first subscriber for an IP Multimedia Subsystem (IMS) service on a second subscriber; obtaining a packet data network (PDN) connection based on the IP connectivity of the first subscriber, through a first network associated with the first subscriber and to a gateway of a second network associated with the second subscriber, if the IP connectivity of the first subscriber is determined to be used; and conducting the IMS service on the second subscriber over the PDN connection; and wherein said obtaining the PDN connection comprises: sending a request to the first subscriber for the PDN connection; and receiving from the first subscriber an acknowledgement of the request.

2. The method of claim 1 , wherein the IP connectivity of the first subscriber is to be used only if the second subscriber has no access to a wireless local area network.

3. The method of claim 2 , wherein the IP connectivity of the first subscriber is to be used only if a radio frequency condition of a cellular service of the second subscriber is below a threshold.

4. The method of claim 2 , wherein the IP connectivity of the first subscriber is to be used only if the second subscriber is in a limited service due to roaming that does not support the IMS service.

5. The method of claim 1 , wherein the PDN connection comprises a PDN gateway of the first network in communications with the gateway of the second network.

6. The method of claim 1 , further comprising: applying a tunneling protocol on IP packets of the IMS service over the PDN connection.

7. The method of claim 6 , wherein the gateway of the second network is an evolved packet data gateway (ePDG).

8. The method of claim 1 , wherein conducting the IMS service comprises: performing an IMS call on the second subscriber over the PDN connection.

9. The method of claim 1 , further comprising: handing-over the PDN connection from the first subscriber to the second subscriber; and conducting the IMS service over a cellular service of the second subscriber by the second network.

10. A user equipment (UE) of wireless communication, comprising: a transceiver; and a processor coupled to the transceiver, the processor configured to: determine whether to use an Internet Protocol (IP) connectivity of a first subscriber for an IP Multimedia Subsystem (IMS) service on a second subscriber; obtain a packet data network (PDN) connection based on the IP connectivity of the first subscriber, through a first network associated with the first subscriber and to a gateway of a second network associated with the second subscriber, if the IP connectivity of the first subscriber is determined to be used; and conduct the IMS service on the second subscriber over the PDN connection via the transceiver; and wherein the processor configured to obtain the PDN connection comprises the processor configured to: send a request to the first subscriber for the PDN connection; and receive from the first subscriber an acknowledgement of the request.

11. The UE of claim 10 , wherein the IP connectivity of the first subscriber is to be used only if the second subscriber has no access to a wireless local area network.

12. The UE of claim 11 , wherein the IP connectivity of the first subscriber is to be used only if a radio frequency condition of a cellular service of the second subscriber is below a threshold.

13. The UE of claim 11 , wherein the IP connectivity of the first subscriber is to be used only if the second subscriber is in a limited service due to roaming that does not support the IMS service.

14. The UE of claim 10 , wherein the PDN connection comprises a PDN gateway of the first network in communications with the gateway of the second network.

15. The UE of claim 10 , wherein the processor is further configured to: apply a tunneling protocol on IP packets of the IMS service over the PDN connection.

16. The UE of claim 15 , wherein the gateway of the second network is an evolved packet data gateway (ePDG).

17. The UE of claim 10 , wherein the processor configured to conduct the IMS service comprises the processor configured to: perform an IMS call on the second subscriber over the PDN connection.

18. The UE of claim 10 , wherein the processor is further configured to: handover the PDN connection from the first subscriber to the second subscriber; and conduct the IMS service over a cellular service of the second subscriber by the second network.

19. An apparatus of wireless communication at a user equipment (UE), comprising: means for determining whether to use an Internet Protocol (IP) connectivity of a first subscriber for an IP Multimedia Subsystem (IMS) service on a second subscriber; means for obtaining a packet data network (PDN) connection based on the IP connectivity of the first subscriber, through a first network associated with the first subscriber and to a gateway of a second network associated with the second subscriber, if the IP connectivity of the first subscriber is determined to be used; and means for conducting the IMS service on the second subscriber over the PDN connection; and wherein the means for obtaining the PDN connection comprises: means for sending a request to the first subscriber for the PDN connection; and means for receiving from the first subscriber an acknowledgement of the request.

20. The apparatus of claim 19 , wherein the IP connectivity of the first subscriber is to be used only if the second subscriber has no access to a wireless local area network.

21. The apparatus of claim 19 , wherein the PDN connection comprises a PDN gateway of the first network in communications with the gateway of the second network.

22. The apparatus of claim 19 , further comprising: means for applying a tunneling protocol on IP packets of the IMS service over the PDN connection.

23. The apparatus of claim 22 , wherein the gateway of the second network is an evolved packet data gateway (ePDG).

24. The apparatus of claim 19 , further comprising: means for handing-over the PDN connection from the first subscriber to the second subscriber; and means for conducting the IMS service over a cellular service of the second subscriber by the second network.

25. A non-transitory computer-readable medium having instructions stored thereon, the instructions comprising codes executable for a user equipment (UE) to perform: determining whether to use an Internet Protocol (IP) connectivity of a first subscriber for an IP Multimedia Subsystem (IMS) service on a second subscriber; obtaining a packet data network (PDN) connection based on the IP connectivity of the first subscriber, through a first network associated with the first subscriber and to a gateway of a second network associated with the second subscriber, if the IP connectivity of the first subscriber is determined to be used; and conducting the IMS service on the second subscriber over the PDN connection; and wherein the codes for obtaining the PDN connection comprises: codes for sending a request to the first subscriber for the PDN connection; and codes for receiving from the first subscriber an acknowledgement of the request.

26. The medium of claim 25 , wherein the IP connectivity of the first subscriber is to be used only if the second subscriber has no access to a wireless local area network.

27. The medium of claim 25 , wherein the PDN connection comprises a PDN gateway of the first network in communications with the gateway of the second network.

28. The medium of claim 25 , further comprising: codes for handing-over the PDN connection from the first subscriber to the second subscriber; and codes for conducting the IMS service over a cellular service of the second subscriber by the second network.